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• Investigate the temperature-dependent AHE in sandwich structures composed of two RE-TM FIM layers. • Complex AHE phenomena explained by the magnetization reversal of individual layers, Hall sign reversal, and the SF transition in the GdFeCo layer. • A model is developed to provide a simplified explanation of the origin of these complex AHE loops. • The model unravels the complexity in AHE loops near and far from the T comp. • The model fits well with the experimental results. The anomalous Hall effect (AHE) has been a remarkable tool for characterizing the magnetic properties of thin films with perpendicular magnetic anisotropy. In this study, we investigate the temperature-dependent AHE in sandwich structures composed of two ferrimagnetic (FIM) layers with different coercivities, using rare-earth-transition-metal (RE-TM) materials. Complex triple AHE loops are obtained near the compensation temperature of GdFeCo, and these loops are explained by considering the magnetization reversal of the individual layers, Hall sign reversal, and the spin-flop transition in the GdFeCo layer. A model is developed to provide a simplified explanation of the origin of these complex AHE loops. This study elucidates the mechanism behind the unusual temperature-dependent AHE response of the technologically important RE-TM FIM films for spintronics applications. [ABSTRACT FROM AUTHOR]

• Identification of Hall-contributor from TEM analysis and AHE measurements in RE-TM FIMs. • Novel sandwich structure of FeCo-compensated GdFeCo and TbFeCo. • ΔR AHE drops towards zero when FeCo-content compensate in the two layers. • FeCo is the major contributor of the anomalous Hall signal. • Temperature dependence of ΔR AHE further supports the claim. The contribution of magnetic sublattices in rare-earth-transition-metal (RE-TM) ferrimagnets (FIMs) has long been debated and is still unclear. The spin-split of 3d conducting electrons in TMs has been known for the anomalous Hall effect (AHE) response, yet in FIMs the contribution from RE is unclear. Here we try to solve the problem by applying a novel sandwich structure of TbFeCo and GdFeCo using Ta spacer. FeCo-content in the two layers is changed from unequal to equal and the AHE resistance (R AHE) of the structure is studied. The difference in R AHE of the two layers is compared with their FeCo-content ratio. This study shows that when the FeCo-content of the two magnetic layers is close, the ΔR AHE is greatly reduced. The results indicate that the AHE signal is majorly contributed by the FeCo-sublattices. The novel approach followed here adds crucial information to the ongoing debate on Hall-contribution in RE-TM FIMs. [ABSTRACT FROM AUTHOR]